Wojciech Szczesny faces the wrath of UEFA for his obscene gesture moments after being sent off on a disastrous night for Arsenal.

Toni Kroos hit a wonder-goal on 54 minutes and substitute Thomas Muller struck an 87th-minute second for a 2-0 away win that puts Bayern Munich in control of their Champions League last-16 tie against Arsene Wenger’s men.

Arsenal put the European champions under pressure at the start but their night began going wrong as early as the eighth minute when Mesut Ozil’s soft penalty was saved.

Before half-time, keeper Szczesny had been sent off and conceded a penalty, which David Alaba missed.

And their quarter-final hopes were all but dead when their resistance fell apart three minutes from time for Mueller’s crushing second goal.

Frustrated defender Per Mertesacker said: “We started really well and deserved one goal. We dropped and dropped after the red card. We kept our defensive spirit.

The Pole was seen by TV cameras making an offensive hand signal as he headed for the tunnel eight minutes before half-time.

If his actions are included in either the referee’s or the match delegate’s report then he could be looking at an additional ban on top of his one-match suspension.

Wenger knew that the Gunners had let a great chance slip by. He said: “Everything went against us. We should have been three up before they got a sniff in the game. The missed penalty killed the crowd a bit.

“It was a very difficult night but a night where the team has shown some quality and some class.”

And on Ozil’s lazy run-up for his spot-kick, Wenger added: “I prefer people to run properly at the ball. Everybody has their own style and you have to respect that. It is his style.”

Ozil left the Emirates stunned when his penalty was brilliantly saved by Germany No.1 Manuel Neuer.

But eight minutes later Bayern left-back Alaba also missed from the spot, hitting a post after sending Lukasz Fabianski the wrong way.

Arsenal, however, will not believe this tie is over after pulling off a stunning second leg win in Munich last season.

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